AMA | September 2024

9126.571 - 9148.926 Sean Carroll

But the standard model predicts that there should be baryon number-violating transitions. They're called sphalerons, and you can look them up. But they're supposed to be so very, very rare in the current universe that you would never notice them. But maybe they were frequent in the early universe. And so even if that's true, even if you started with unequal numbers of baryons and antibaryons—